Markets suck at pricing on negative externalities. It is literally the textbook example of market failure. That's why we need regulation (e.g. Carbon taxes) to

Markets suck at pricing on negative externalities. It is literally the textbook example of market failure. That's why we need regulation (e.g. Carbon taxes) to step in and make sure those costs are accounted for. I don't know what kind of hypothetical utopian market you're referring to, but it's not one that exists in human societies.